Improvement in machine for sawing- marble



N.FETE.RS, PHDTO-LITNOGRAFHER, WASHINGTON D C gtniied tatta parte eine.

R. S.' CRAIG AND A. H. WOODWARD, OF DOVER, NEW YORK.

Letters -Patcnt N 100,378, dated Mch 1, 1870.

IMPROVEMENT IN MACHINE ron sAwING MARBLE.

The Schedule referred to in these Letters Patent and making part of the same` To all whom tt may concern Be it known that we, R. S. CRAIG and A. H. WOODWARD, .of Dover, in the county of Dutchess, and State of New York, have Ainvented a'new and useful Improvement in Machines for Sawing Marble and other Stones; and we do hereby declare vthat the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings forming part of this specification, in whch- Figure 1 is a vertical section of our improved machine, taken through the line x g. 3, looking to the lett.

Figure 2 is a 4vertical section of the same, taken through the line y y, iig. 3, looking to the right.

Figure 3 is a top view of the same, partsbeing broken away, and partlyiu section through thefline z z, iig. 1, to show the const-ruction.

Similar letters of reference indicate corresponding parts.

Our invention has'for its object to furnish an improved machine for sawing marble and other stone, tapering or upon an incline, which shall be simple in'const-ruction and effective in operation, being so constructed and arranged that the sand cannot wear the guide-rollers or their bearings, and so that' the stone or marble being sawn may be conveniently shifted or replaced with 'a new block;.and

It consists in the construction and combination of various parts of the machine, as hereinafter more fully described.

A is the main frame of the machine.

B is the saw or cradle-frame to which the Hexible saws C, one or more, are attached, and which is suspended by the chains D, the lowerends of which are attached to the frame B at or ner its corners, and which pass over guide-pulleys attached to the upper parts otl the frame A.

The upper ends of the chains D are attached to a drum or shaft, E, which works in bearings attached to the middle part ofthe top ot' the ii'anie A, and which may he operated to raise the ti'anie B by a rope and friction-pulleys or other convenient and well-known means.

The inncr side of the posts of thc frame A are grooved longitudinally to receive the feather or long tenons of the cross-heads of the cross-bars or beams F, so that the said bars or beams F may be raised and lowered as desired. v

G are chains, the lower ends of which are attached to the bars F near their ends.

The chains G pass overguidc-pulleys attached to the upper parts of the frame A, and their upper ends are attached to the shaft or drum E, so that the cross-heams'F and their attachments may be raised and lowered at the same time with the sawframe B, and by the same operation.

',lhe cross-beams F are slotted longitudinally to reflange u on each end as shown in'i r. 2 'or the ma be made long and withoutk end-flanges, as shown in Iig. 1.

The spindles I are made with an enlargement or head upon their lower ends, which enters an enlargement or conntersink in ther lower end of the rollersl J, so that the bearings of said rollers may' he within their bodies, and entirely protected from the sand from the saws. l

One cross-beam F may be used for the support oi' each set ot' rollers and spindles, as shown in tig. 2, or two beams F may be used, as shown 'in lig. l, the lower beam being provided with bearings and setscrews, to support the lower ends of the spindles I. It will be observed that the guide-rollersv J are raised and lowered upon the spindles'with the rise and fall of the saws as the saw-frame is4 swung back and forth.

As the saw cuts its way into the stone, the crossbeams are fed down with the saw-frame, as hereinbefore described, so that the rollers and saws may always have the same relative position.`

`It should be observed that more saws and guiderollers may be added to the machine if desired, the saws inclinlng alternately in opposite directions, so

that the. entire block may be sawn at one operation.v

By this construction the saws, saw-frame, guiderollers, and cross-beams may all be conveniently and quickly raised o'ut of the way, leaving the lower part ot' the machine free, for convenience in placing or sluiting the blocks in position upon or removing them from the machine.

If desired, the chains G may be omitted, andA fricwtion-rollers K attachedrto the ends of the cross-bars F which rest upon the side-bars of the saw-frame B, so that the spindles and rollers that guide the saws may be supported by' the saw-trame B and raised and lowered by and with it.

The particular-manner in which the cross-beams F and saw-frame B are connected to each other depends upon the construction of the machine with which our improvements are connected. Having thus described our invention,

\Vhat we .claim as our invention, and desire to secure by Letters Patent, is p rIhe rollers J J, recessed in their lower ends so as to inclose and protect from sand and water the heads H H of the spindles I I, 4substantially as and for the purpose herein specified. v

R. S. CRAIG. lVitnesses: A. H. WOOIWVARI).4

FRANK BLOCKLEY, JAMES T. GRAHAM. 

